This project is intended to modify the transmissibility characteristics of a metamaterial leveraging non-uniform tuning of locally resonating systems (resonators) associated with the main structure. Typically, the natural frequencies of the resonators are evenly tuned at a certain target frequency. As a result, the transmissibility (structural response to excitation ratio) is drastically reduced for a certain range of excitation frequencies starting at the target frequency. The width of such a frequency range (bandgap), however, strongly depends on the added mass (the more the added mass, the wider the bandgap). Therefore, the motivation for this project is to achieve configurations that lead to wider bandgaps while reducing the system mass. The results of this project are expected to support future research in which the resonators non-uniformity could be promoted by smart materials (such as piezoceramics and/or shape-memory alloys). In such a case, real time tuning of the resonators could take place as the excitation characteristics change, yielding an adaptive system.
News published in Agência FAPESP Newsletter about the scholarship: